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Debt - Other Indebtedness (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2015
Dec. 31, 2017
LIBOR | Effective Rate Calculation Option 2    
Debt Instrument [Line Items]    
Coupon rate, floating rate notes 1.00%  
Federal Funds Effective Rate    
Debt Instrument [Line Items]    
Coupon rate, floating rate notes 0.50%  
Commercial Paper    
Debt Instrument [Line Items]    
Outstanding debt   $ 0
Commercial Paper | Revolving Credit Facility    
Debt Instrument [Line Items]    
Borrowing capacity reserved, commercial paper   1,500,000,000
Unsecured Debt | Revolving Credit Facility    
Debt Instrument [Line Items]    
Commercial paper program   1,500,000,000
Debt term 5 years  
Outstanding debt   0
Maximum borrowing capacity   2,000,000,000
Allowable increase in borrowing capacity, maximum $ 1,000,000,000  
Remaining borrowing capacity   $ 500,000,000
Minimum | LIBOR | Effective Rate Calculation Option 1    
Debt Instrument [Line Items]    
Coupon rate, floating rate notes 0.875%  
Minimum | LIBOR | Effective Rate Calculation Option 3    
Debt Instrument [Line Items]    
Coupon rate, floating rate notes 0.00%  
Maximum | LIBOR | Effective Rate Calculation Option 1    
Debt Instrument [Line Items]    
Coupon rate, floating rate notes 1.50%  
Maximum | LIBOR | Effective Rate Calculation Option 3    
Debt Instrument [Line Items]    
Coupon rate, floating rate notes 0.50%  
Maximum | Commercial Paper    
Debt Instrument [Line Items]    
Debt term   397 days